Method of manufacturing negative electrode for nonaqueous electrolyte secondary battery

Abstract

A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery, the method includes mixing negative electrode active material particles and ferroelectric particles with each other to form first composite particles in which the ferroelectric particles are attached to the negative electrode active material particles; mixing the first composite particles and a binder with each other to form granulated particles; applying pressure to an aggregate of the granulated particles to form a sheet-shaped negative electrode mixture layer; and arranging the negative electrode mixture layer on a main surface of a negative electrode current collector foil.

What is claimed is: 
     
       1. A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery, the method comprising:
 mixing negative electrode active material particles and ferroelectric particles with each other to form first composite particles in which the ferroelectric particles are attached to the negative electrode active material particles; 
 mixing the first composite particles and a first binder with each other to form second composite particles; 
 mixing the second composite particles with a second binder to form granulated particles having a solid content concentration of 70 mass % or higher and lower than 90 mass %; 
 applying pressure to an aggregate of the granulated particles to form a sheet-shaped negative electrode mixture layer; and 
 arranging the negative electrode mixture layer on a main surface of a negative electrode current collector foil. 
 
     
     
       2. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 a mixing amount of the ferroelectric particles is 5 mass % to 40 mass % with respect to a total mass of the negative electrode mixture layer. 
 
     
     
       3. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 the ferroelectric particles are barium titanate particles. 
 
     
     
       4. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 negative electrode active material particles and ferroelectric particles are mixed with each other through a dry process to form the first composite particles in which the ferroelectric particles are attached to the negative electrode active material particles. 
 
     
     
       5. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 the second composite particles have a solid content concentration of 90 mass % to 95 mass %. 
 
     
     
       6. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 the first binder is a powder which has a D50 particle size of 200 μm or less. 
 
     
     
       7. The method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery according to  claim 1 , wherein
 a mixing amount of the first binder is 0.5 mass % to 2 mass % with respect to the total mass of the negative electrode mixture layer. 
 
     
     
       8. A method of manufacturing a negative electrode for a nonaqueous electrolyte secondary battery, the method comprising:
 mixing negative electrode active material particles and ferroelectric particles with each other to form first composite particles in which the ferroelectric particles are attached to the negative electrode active material particles; 
 mixing the first composite particles and a first binder with each other to form second composite particles; 
 mixing the second composite particles with a second binder to form granulated particles having a solid content concentration of 70 mass % or higher and lower than 90 mass %; 
 applying pressure to an aggregate of the granulated particles to form a sheet-shaped negative electrode mixture layer; and 
 arranging the negative electrode mixture layer on a main surface of a negative electrode current collector foil, 
 wherein the method does not include the formation of a slurry.